Personally, I don't find it very attractive. It IS beautifully functional, though. So I guess that, to a large extent, is an embodiment of NASA; which will work out well for them.
Not attractive but functional?
Yep, they are running Drupal 7.
I like it, but I wish they actually had a (often rotated) space porn hero above the fold. People forget how awesome space looks sometimes, and I'm a sucker for it.